Table 1. Grain yield and yield components of two inbred rice varieties under different nitrogen and sowing density treatments in 2017 and 2018.

Variety	Density	Nitrogen	Panicles m−2	Spikelets panicle−1	grain filling (%)	Grain weight (mg)	Grain yield (t ha−1)
2017
HHZ	LD	N0	232 ± 12b	104 ± 6b	94.2 ± 0.1a	20.2 ± 0.1a	4.31 ± 0.29b
		LN	354 ± 14a	189 ± 10a	88.1 ± 1.4b	19.5 ± 0.3ab	9.30 ± 0.54a
		HN	398 ± 4a	200 ± 10a	80.3 ± 2.8c	18.2 ± 0.6b	9.59 ± 0.42a
	HD	N0	274 ± 8c	129 ± 7b	89.4 ± 0.9a	19.8 ± 0.3a	5.01 ± 0.51c
		LN	397 ± 15b	197 ± 12a	82.5 ± 1.1a	18.9 ± 0.6a	10.14 ± 0.58a
		HN	396 ± 18a	190 ± 12a	79.7 ± 0.8b	18.0 ± 0.3b	8.91 ± 0.31b
YNSM	LD	N0	240 ± 15b	118 ± 7b	90.3 ± 1.8a	20.2 ± 0.3a	4.29 ± 0.22b
		LN	333 ± 8a	190 ± 5a	86.9 ± 0.9b	19.8 ± 0.4a	9.57 ± 0.23a
		HN	400 ± 14a	201 ± 13a	80.7 ± 2.2c	18.4 ± 0.5b	9.41 ± 0.33a
	HD	N0	246 ± 11c	123 ± 7b	90.2 ± 1.8a	20.2 ± 0.4a	4.89 ± 0.29c
		LN	394 ± 15b	189 ± 10a	84 ± 2.7b	19.5 ± 0.4b	10.22 ± 0.33a
		HN	409 ± 17a	191 ± 9a	79.4 ± 1.2b	18.3 ± 0.5c	9.27 ± 0.45b
2018
HHZ	LD	N0	197 ± 8c	165 ± 6b	92.8 ± 1.5a	18.9 ± 0.2a	5.98 ± 0.58c
		LN	241 ± 29b	170 ± 7b	92.7 ± 1.6a	18.8 ± 1.0a	8.42 ± 0.53b
		HN	358 ± 2a	191 ± 6a	91.0 ± 2.0b	19.1 ± 0.1a	9.25 ± 0.52a
	HD	N0	245 ± 12c	167 ± 7b	92.7 ± 2.0a	19.0 ± 0.5a	6.24 ± 0.24c
		LN	304 ± 12b	174 ± 9b	93.2 ± 0.8a	18.8 ± 1.0a	9.01 ± 0.28b
		HN	368 ± 31a	183 ± 8a	93.2 ± 1.2a	19.4 ± 1.4a	9.85 ± 1.13a

Within a column for each year, means followed by the same letters are not significantly different according to LSD (0.05).